The rules for installing receptacle outlets in one- and two-family dwelling units are more stringent than for commercial or industrial occupancies. If the required number of receptacles are not installed in a dwelling unit, the power needed to serve the number of appliances in use today will not be available. Therefore, in dwelling units only, a specific number shall be installed. However, this rule does not apply to commercial and industrial locations. Receptacles are installed as needed for cord-and-plug electrical items. Extension cords used improperly create a fire hazard. For this reason, the National Electrical Code requires outlets in all types of occupancies to be installed in such a manner as to cord-and-plug connect appliance loads without the use of extension cords.

GFCI and AFCI protection of 15 or 20 amp, 125 volt receptacle outlets shall be required in specified areas, some of which are located indoors and outdoors to protect personnel and property from electric shock and arcing faults while using cord-and-plug connected electric hand tools, radios, televisions, stereos, etc. GFCI protection applies to certain areas in dwelling units, commercial locations, and industrial locations.

Note, for information on ADA Standards for accessible design, see Annex J in the NEC.

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